changelog: fragment for #8210

Author: Ralph Küpper

changelog.d/8210-release-next-fixture-guard-knob.md

@@ -0,0 +1,14 @@
+### Testing
+
+- `tests/release/packages/next-app-route/fixture.sh` now runs the armed
+  `routeModule.handle` bypass guard (its `perry-host.js` is byte-identical to
+  `tests/fixtures/next-app-route/perry-host.js`) and greps every cold-start log
+  for `generated handler bypassed` as a hard failure — the guard's only signal is
+  the host log; `verify.mjs` exits 0 when it fires (#8161).
+- The two hard-coded verifier passes per cold start became
+  `PERRY_NEXT_ROUTE_VERIFIERS_PER_START` (default 10), so the default run is
+  10 cold starts × 10 passes = 100 batches, matching
+  `tests/test_next_app_route_dylib.sh` and #8040's 100-iteration bullet. With
+  the default this fixture is red on today's `main` because of #8163 (~2% of
+  warm batches lose one response after a default-mode copying minor); `=2`
+  restores the previous coverage. The forced-evacuation arm is unchanged.